<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.21/dist/vue.min.js"></script>

<body>

<div id="app">
  <h1 v-if="type==='A'">A</h1>
  <h1 v-else-if="type==='B'">B</h1>
  <h1 v-else-if="type==='C'">C</h1>
</div>


<!--导入vue。js-->
<script>
  var vm = new Vue({
    el:"#app",
    data:{
      type:'A'
    }
  });

</script>
</body>
</html>